Question: Why do hashtag annotations of an image often contain false negatives? Some hashtags are not visual (for example, #tbt) Some of the hashtags associated with

Why do hashtag annotations of an image often contain false negatives?

Some hashtags are not visual (for example, #tbt)

Some of the hashtags associated with the image are not visually present in the image

Some things that are visually present in the image are not listed in the associated hashtags

Some hashtags are entire sentences (for example, #thisisadifficultquestion)

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